#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_dec_interceptor.h"
#include <time.h>

zend_op_array *(*prev_compile_file)(zend_file_handle *file_handle, int type) = NULL;
zend_op_array *(*prev_compile_string)(zend_string *source_string, const char *filename) = NULL;
void (*prev_execute_ex)(zend_execute_data *execute_data) = NULL;


zend_op_array *hook_compile_file(zend_file_handle *file_handle, int type)
{
    FILE *log = fopen("/tmp/dec_interceptor.log", "a");
    if (log) {
        fprintf(log, "[%ld] hook_compile_file called\n", (long)time(NULL));
        if (file_handle && file_handle->filename) {
            fprintf(log, "[%ld] file_handle->filename = %s\n", (long)time(NULL), file_handle->filename);
        }
    }

    // 判断是否是 install.php 或其他目标加密文件
    if (file_handle && file_handle->filename && strstr(file_handle->filename, "install.php")) {
        if (file_handle->type == ZEND_HANDLE_FP && file_handle->handle.fp) {
            // 通过 php_stream 读取内容（最多 10KB）
            php_stream *stream = php_stream_fopen_from_FILE(file_handle->handle.fp, file_handle->filename, "rb");
            if (stream) {
                if (php_stream_seek(stream, 0, SEEK_SET) == 0) {
                    char buffer[10241] = {0};  // 额外 1 字节存 null terminator
                    size_t len = php_stream_read(stream, buffer, 10240);

                    if (len > 0 && log) {
                        fprintf(log, "[%ld] [DECRYPTED_STREAM_SOURCE install.php] (%zu bytes):\n", (long)time(NULL), len);
                        fprintf(log, "%.*s\n", (int)len, buffer);
                    }
                    php_stream_seek(stream, 0, SEEK_SET);  // 恢复位置
                }
                php_stream_close(stream);  // 不会关闭 file_handle->handle.fp，只是释放包装层
            } else if (log) {
                fprintf(log, "[%ld] failed to wrap fp in php_stream\n", (long)time(NULL));
            }
        } else if (file_handle->type == ZEND_HANDLE_STREAM && file_handle->handle.stream.handle) {
            php_stream *stream = (php_stream *)file_handle->handle.stream.handle;
            if (php_stream_seek(stream, 0, SEEK_SET) == 0) {
                char buffer[10241] = {0};
                size_t len = php_stream_read(stream, buffer, 10240);

                if (len > 0 && log) {
                    fprintf(log, "[%ld] [DECRYPTED_STREAM_SOURCE install.php] (%zu bytes):\n", (long)time(NULL), len);
                    fprintf(log, "%.*s\n", (int)len, buffer);
                }
                php_stream_seek(stream, 0, SEEK_SET);
            }
        } else if (log) {
            fprintf(log, "[%ld] unsupported file_handle->type: %d\n", (long)time(NULL), file_handle->type);
        }
    }

    if (log) {
        fclose(log);
    }

    return prev_compile_file ? prev_compile_file(file_handle, type) : NULL;
}




zend_op_array *hook_compile_string(zend_string *source_string, const char *filename)
{
    const char *src = ZSTR_VAL(source_string);
    size_t len = ZSTR_LEN(source_string);

    // ✅ 判断是否是内存 eval 源码：没有文件名 或者 文件名是 "eval()'d code"
    if (!filename || strstr(filename, "eval()'d code")) {
        // 🔒 swoole_loader 的解密逻辑产生的源码

        // 🔍 添加特征过滤：必须包含 "<?php" 或者 "function"/"class"
        if (memmem(src, len, "<?php", 5) || memmem(src, len, "function ", 9) || memmem(src, len, "class ", 6)) {
            // ✅ 命中加密解密的源码，写入临时文件
            char pathbuf[512];
            snprintf(pathbuf, sizeof(pathbuf), "/tmp/decrypted_%ld.php", (long)time(NULL));
            FILE *out = fopen(pathbuf, "w");
            if (out) {
                fwrite(src, 1, len, out);
                fclose(out);
            }

            FILE *log = fopen("/tmp/dec_interceptor.log", "a");
            if (log) {
                fprintf(log, "[%ld] Decrypted eval code dumped to %s\n", (long)time(NULL), pathbuf);
                fclose(log);
            }
        }
    }

    return prev_compile_string ? prev_compile_string(source_string, filename) : NULL;
}



// zend_op_array *hook_compile_string(zend_string *source_string, const char *filename)
// {
//     FILE *f = fopen("/tmp/dec_interceptor.log", "a");
//     if (f) {
//         fprintf(f, "[%ld] hook_compile_string: filename = %s\n", (long)time(NULL), filename ? filename : "(null)");
//         fprintf(f, "[DECRYPTED] %.*s\n", (int)(ZSTR_LEN(source_string) > 200 ? 200 : ZSTR_LEN(source_string)), ZSTR_VAL(source_string));
//         fclose(f);
//     }

//     return prev_compile_string ? prev_compile_string(source_string, filename) : NULL;
// }

void hook_execute_ex(zend_execute_data *execute_data)
{
    const zend_function *func = execute_data->func;

    if (func && ZEND_USER_CODE(func->type)) {
        const zend_op_array *opa = &func->op_array;
        FILE *f = fopen("/tmp/dec_interceptor.log", "a");
        if (f) {
            const char *fname = func->common.function_name ? ZSTR_VAL(func->common.function_name) : "(no name)";
            const char *file = opa->filename ? ZSTR_VAL(opa->filename) : "(no file)";
            fprintf(f, "[%ld] hook_execute_ex: %s (from %s)\n", (long)time(NULL), fname, file);

            fprintf(f, "  op_array dump: %d opcodes\n", opa->last);
            for (int i = 0; i < opa->last; ++i) {
                const zend_op *op = &opa->opcodes[i];
                fprintf(f, "    [%03d] opcode=%d  op1_type=%d  op2_type=%d  result_type=%d\n",
                        i, op->opcode, op->op1_type, op->op2_type, op->result_type);
            }
            fclose(f);
        }
    } else {
        FILE *f = fopen("/tmp/dec_interceptor.log", "a");
        if (f) {
            fprintf(f, "[%ld] hook_execute_ex: (internal or unknown function)\n", (long)time(NULL));
            fclose(f);
        }
    }

    if (prev_execute_ex) {
        prev_execute_ex(execute_data);
    }
}

PHP_RINIT_FUNCTION(dec_interceptor)
{
    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] RINIT: zend_compile_file = %p\n", (long)time(NULL), zend_compile_file);
        fclose(f);
    }
    return SUCCESS;
}

PHP_MINIT_FUNCTION(dec_interceptor)
{
    prev_compile_file = zend_compile_file;
    zend_compile_file = hook_compile_file;

    prev_compile_string = zend_compile_string;
    zend_compile_string = hook_compile_string;

    prev_execute_ex = zend_execute_ex;
    zend_execute_ex = hook_execute_ex;

    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] MINIT done\n", (long)time(NULL));
        fclose(f);
    }

    return SUCCESS;
}

PHP_MSHUTDOWN_FUNCTION(dec_interceptor)
{
    zend_compile_file = prev_compile_file;
    zend_compile_string = prev_compile_string;
    zend_execute_ex = prev_execute_ex;

    FILE *f = fopen("/tmp/dec_interceptor.log", "a");
    if (f) {
        fprintf(f, "[%ld] MSHUTDOWN done\n", (long)time(NULL));
        fclose(f);
    }

    return SUCCESS;
}

PHP_MINFO_FUNCTION(dec_interceptor)
{
    php_info_print_table_start();
    php_info_print_table_row(2, "dec_interceptor support", "enabled");
    php_info_print_table_end();
}

zend_module_entry dec_interceptor_module_entry = {
    STANDARD_MODULE_HEADER,
    "dec_interceptor",
    NULL,
    PHP_MINIT(dec_interceptor),
    PHP_MSHUTDOWN(dec_interceptor),
    PHP_RINIT(dec_interceptor),
    NULL,
    PHP_MINFO(dec_interceptor),
    PHP_DEC_INTERCEPTOR_VERSION,
    STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE(dec_interceptor)